The pulsations of PG 1351+489

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50926

Title:	The pulsations of PG 1351+489
Authors:	Redaelli,M;Kepler,SO;Costa,JES;Winget,DE;Handler,G;Castanheira,BG;Kanaan,A;Fraga,L;Henrique,P;Giovannini,O;Provencal,JL;Shipman,HL;Dalessio,J;Thompson,SE;Mullally,F;Brewer,MM;Childers,D;Oksala,ME;Rosen,R;Wood,MA;Reed,MD;Walter,B;Strickland,W;Chandler,D;Watson,TK;Nather,RE;Montgomery,MH;Bischoff-Kim,A;Hansen,CJ;Nitta,A;Kleinman,SJ;Claver,CF;Brown,TM;Sullivan,DJ;Kim,SL;Chen,WP;Yang,M;Shih,CY;Zhang,X;Jiang,X;Fu,JN;Seetha,S;Ashoka,BN;Marar,TMK;Baliyan,KS;Vats,HO;Chernyshev,AV;Ibbetson,P;Leibowitz,E;Hemar,S;Sergeev,AV;Andreev,MV;Janulis,R;Meistas,EG;Moskalik,P;Pajdosz,G;Baran,A;Winiarski,M;Zola,S;Ogloza,W;Siwak,M;Bognar,Z;Solheim,JE;Sefako,R;Buckley,D;Donoghue,D;Nagel,T;Silvotti,R;Bruni,I;Fremy,JR;Vauclair,G;Chevreton,M;Dolez,N;Pfeiffer,B;Barstow,MA;Creevey,OL;Kawaler,SD;Clemens,JC
Contributors:	天文研究所
Keywords:	WHITE-DWARF STARS;WHOLE EARTH TELESCOPE;TIME-SERIES ANALYSIS;PERIOD CHANGE;EVOLUTION;PG-1351+489;GD-358;GD358
Date:	2011
Issue Date:	2012-03-27 18:13:03 (UTC+8)
Publisher:	國立中央大學
Abstract:	PG 1351+489 is one of the 20 DBVs - pulsating helium-atmosphere white dwarf stars - known and has the simplest power spectrum for this class of star, making it a good candidate to study cooling rates. We report accurate period determinations for the main peak at 489.334 48 s and two other normal modes using data from the Whole Earth Telescope (WET) observations of 1995 and 2009. In 2009, we detected a new pulsation mode and the main pulsation mode exhibited substantial change in its amplitude compared to all previous observations. We were able to estimate the star's rotation period, of 8.9 h, and discuss a possible determination of the rate of period change of (2.0 +/- 0.9) x 10(-13) s s(-1), the first such estimate for a DBV.
Relation:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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